Search International and National Patent Collections

1. (WO2004036046) VANE TYPE VACUUM PUMP

Pub. No.:    WO/2004/036046    International Application No.:    PCT/JP2002/010661
Publication Date: Apr 29, 2004 International Filing Date: Oct 15, 2002
IPC: F01C 21/08
F04C 18/344
F04C 27/00
Applicants: MITSUBISHI DENKI KABUSHIKI KAISHA

Inventors: KUSUMOTO, Katsuhiko

ONOUE, Shigeru

Title: VANE TYPE VACUUM PUMP
Abstract:
A vane type vacuum pump having a rotor (34) for rotating a vane (42) while sliding it on a housing (21) and provided concentrically with a rotary shaft (31) between the housing and the rotor, substantially over the entire circumference, with a labyrinth-like seal having at least a set of circular circumferential groove (44) and a circular circumferential protrusion (43) fitted to move relatively in the circumferential direction. The protrusion or the groove is continuous on the housing side but discontinuous on the rotor side so that it does not impede radial movement of the vane and the vane is provided with a clearance (49).